I just installed mine last week after having it sit in the box for about 3 months. Not a terrible install. you want to be pretty accurate when drill the holes so i would suggest starting with a small pilot hole. It was bit awkward to keep the drill straight. Then loosen the back plate on the gantry and slide the performance pieces in. When you tighten the back plate back on it should make contact with the performance pieces.

It did help with vibration along the Y-axis. I havent noticed any other changes.